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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bff9029e161943da14f1888e901beee9f31925d5eed20f47a17f0e78fc76b98' 
  AND token = '/wFmU6lIUgxBxOVymCh27xsZzX9Mk6GDwAxAdQ2pi1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}